- It helps in detectinIt helps in detecting defects that are far-surface, near-surface, or surface breaking.g defects that are far-surface, near-surface, or surface breaking.
- It can differentiate between OD and ID defects.
- Eddy current tube inspection can detect cracks, large porosities, wear, corrosion, and other volumetric defects.
- In about 10 hours’ time, we can examine up to 700 tubes, each measuring 6 meters on average.
- We can perform this test in applications for different reasons, apart from detecting flaws
- The testing can be performed through coatings and paint. These are:
- a. Measuring thickness of coating
- b. Testing condenser tubes, wires etc.
- c. Detection of subsurface corrosion
- d. Inspecting bolt holes
- e. Inspection of corrosion under fireproofing and insulation – CUF and CUI
- f. Detecting surface cracks on aluminum alloys
- g. Detection of thinning or discontinuities of walls of tubes non-ferromagnetic in nature.
- h. Inspection can be conducted without the eddy current tube probes touching the part being inspected.
How is it done at Technomax
At Technomax we use electromagnetic induction to identify tubing flaws, by inserting a probe into the tube and making it travel its whole length. Our technicians send alternating current into the coil and this generates a round magnetic field around it. Then the probe’s electromagnetic coils generate eddy currents, and our team measures the probe’s electrical impedance. The defects in the tube are revealed through the information collected by the probe. The software records the scanned data, which we maintain to use as backup for the future.
- For air conditioner tubing applications, the technique differs slightly as the design of the equipment is different. Heat dissipation is achieved with the use of integral fins, which means they are vulnerable to circumferential cracking. Inspection becomes more difficult as the un-finned land area is used for inserting the bundle support plate. Hence eddy current tube bobbins are used to check the straight integral finned tube portion. However, they are not as effective in detecting circumferential cracks and at the support plates as the previous method. This happens because there is a huge variation in the liftoff which affects the probe’s signal significantly.
- At Technomax we use dedicated AC probes with best-in-class AC coil configuration made with study material, with probe heads that can be easily detached. With these new sensors we can identify circumferential cracks; thanks to the low variation in the liftoff, it can also detect cracks in tube sheet and support plate locations, giving data that is precise and reliable.
- Technomax has considerable experience in eddy current tube testing for different industries, and we understand that businesses need to get their equipment up and running as quickly as possible. Outages and downtimes hamper productivity, and this is why our technicians are trained to perform these inspections thoroughly in the shortest possible time. With zero compromise on quality, we provide some of the quickest eddy current tube inspection services.